摘要
为解决超细尾砂胶结充填材料(CUTB)流动性差、强度低的问题,分析了减水剂(SP)对CUTB的浆体流变、固化强度及波速等的改善效果,并提出了基于絮凝体含水量的屈服应力预测模型。结果表明:(1)当SP掺量从0增加到0.04%时,屈服应力和等效塑性黏度分别降低了51.3%和37.5%;(2)提出的考虑絮凝体含水量的动态屈服应力模型是科学有效的,最大堆积密度和有效固体浓度是影响新拌CUTB屈服应力的主要微观因素;(3) SP能够显著提高CUTB的强度,当SP掺量从0增加到0.04%时,3、7、28 d强度分别提高了17.7%,34.0%和28.0%;(4)最优的SP掺量为0.03%。研究结果可为矿山实际利用SP改善CUTB性能提供参考。
In order to solve the problem of poor flow and low strength of cemented ultra-fine tailings backfill(CUTB),this paper investigated the improvement effect of superplasticizer(SP)on the properties of CUTB such as rheology,strength and ultrasonic pulse velocity,and proposed a prediction model of yield stress based on the water content of flocculant.The re-sults show that:①The yield stress and equivalent plastic viscosity decreased by 51.3%and 37.5%,respectively,when the SP content increased from 0 to 0.04%.②The proposed dynamic yield stress model considering the water content of floc is scien-tifically valid,and the maximum packing density and effective solids concentration are the main fine-scale factors affecting the yield stress of fresh CUTB.③SP can significantly improve the strength of CUTB.When the SP content was increased from 0 to 0.04%,the 3,7,28 dstrengths were increased by 17.7%,34.0%and 28.0%,respectively.④The optimal SP content was 0.03%.The results of this paper provide a reference for the actual use of SP to improve the performance of CUTB in mines.
作者
周浩
孙晓刚
邱景平
郭镇邦
张世玉
袁龙
王成利
ZHOU Hao;SUN Xiaogang;QIU Jingping;GUO Zhenbang;ZHANG Shiyu;YUAN Long;WANG Chengli(School of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China;Anshan Iron and Steel Labor Health Research Institute Technology Co.,Ltd.,Anshan 114031,China)
出处
《金属矿山》
CAS
北大核心
2023年第11期167-173,共7页
Metal Mine
基金
辽宁省重大科技专项(编号:2020JH1/10300005)
国家自然科学基金项目(编号:51774066)。
关键词
减水剂
超细尾砂
动态屈服应力
单轴抗压强度
超声波波速
superplasticizer
ultra-fine tailings
dynamic yield stress
uniaxial compressive strength
ultrasonic pulse ve-locity
